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实现　　建立一个maven工程，向pom.xml中添加如下信息：1234567891011121314151617181920212223">
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      RPC系列二之Hessian源码分析
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        <h2 id="u7B80_u4ECB"><a href="#u7B80_u4ECB" class="headerlink" title="简介"></a>简介</h2><p>　　hessian是一个采用二进制格式传输的服务框架，相对传统soap web service，更轻量，更快速。下面先通过一个简单的示例让大家对hessian有一个简单的认识，之后深入源码分析其实现机制。在下一篇博客中我们将介绍与spring的集成与原理！</p>
<h2 id="u5B9E_u73B0"><a href="#u5B9E_u73B0" class="headerlink" title="实现"></a>实现</h2><p>　　建立一个maven工程，向pom.xml中添加如下信息：<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">dependencies</span>&gt;</span></span><br><span class="line">    <span class="comment">&lt;!--&lt;dependency&gt;</span><br><span class="line">        &lt;groupId&gt;com.caucho&lt;/groupId&gt;</span><br><span class="line">        &lt;artifactId&gt;hessian&lt;/artifactId&gt;</span><br><span class="line">        &lt;version&gt;3.0.8&lt;/version&gt;</span><br><span class="line">    &lt;/dependency&gt;--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">groupId</span>&gt;</span>com.caucho<span class="tag">&lt;/<span class="title">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">artifactId</span>&gt;</span>hessian<span class="tag">&lt;/<span class="title">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">version</span>&gt;</span>2.1.12<span class="tag">&lt;/<span class="title">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="title">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">groupId</span>&gt;</span>javax.servlet<span class="tag">&lt;/<span class="title">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">artifactId</span>&gt;</span>servlet-api<span class="tag">&lt;/<span class="title">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">version</span>&gt;</span>2.5<span class="tag">&lt;/<span class="title">version</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">scope</span>&gt;</span>provided<span class="tag">&lt;/<span class="title">scope</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="title">dependency</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="title">dependencies</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="title">build</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">pluginManagement</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">plugins</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="title">plugin</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="title">groupId</span>&gt;</span>org.apache.maven.plugins<span class="tag">&lt;/<span class="title">groupId</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="title">artifactId</span>&gt;</span>maven-compiler-plugin<span class="tag">&lt;/<span class="title">artifactId</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="title">version</span>&gt;</span>3.1<span class="tag">&lt;/<span class="title">version</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="title">configuration</span>&gt;</span></span><br><span class="line">                    <span class="tag">&lt;<span class="title">source</span>&gt;</span>1.6<span class="tag">&lt;/<span class="title">source</span>&gt;</span></span><br><span class="line">                    <span class="tag">&lt;<span class="title">target</span>&gt;</span>1.6<span class="tag">&lt;/<span class="title">target</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;/<span class="title">configuration</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;/<span class="title">plugin</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="title">plugins</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="title">pluginManagement</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">plugins</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">plugin</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="title">groupId</span>&gt;</span>org.apache.tomcat.maven<span class="tag">&lt;/<span class="title">groupId</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="title">artifactId</span>&gt;</span>tomcat6-maven-plugin<span class="tag">&lt;/<span class="title">artifactId</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="title">version</span>&gt;</span>2.0<span class="tag">&lt;/<span class="title">version</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="title">plugin</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">plugin</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="title">groupId</span>&gt;</span>org.apache.maven.plugins<span class="tag">&lt;/<span class="title">groupId</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="title">artifactId</span>&gt;</span>maven-war-plugin<span class="tag">&lt;/<span class="title">artifactId</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="title">version</span>&gt;</span>2.5<span class="tag">&lt;/<span class="title">version</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="title">plugin</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="title">plugins</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="title">build</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>　　接着定义一个服务接口和实现类，如下所示：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">MyService</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">doSomething</span><span class="params">(String str)</span></span>;</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MySeriviceImpl</span> <span class="keyword">implements</span> <span class="title">MyService</span> </span>&#123;</span><br><span class="line">    <span class="annotation">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">doSomething</span><span class="params">(String str)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">"hello "</span> + str;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>　　在web.xml中添加如下内容：<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">servlet</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">servlet-name</span>&gt;</span>myservice<span class="tag">&lt;/<span class="title">servlet-name</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">servlet-class</span>&gt;</span>com.caucho.hessian.server.HessianServlet<span class="tag">&lt;/<span class="title">servlet-class</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="tag">&lt;<span class="title">init-param</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">param-name</span>&gt;</span>service-class<span class="tag">&lt;/<span class="title">param-name</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">param-value</span>&gt;</span>com.shihc.hessian.MySeriviceImpl<span class="tag">&lt;/<span class="title">param-value</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="title">init-param</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">load-on-startup</span>&gt;</span>1<span class="tag">&lt;/<span class="title">load-on-startup</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="title">servlet</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="title">servlet-mapping</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">servlet-name</span>&gt;</span>myservice<span class="tag">&lt;/<span class="title">servlet-name</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">url-pattern</span>&gt;</span>/myservice<span class="tag">&lt;/<span class="title">url-pattern</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="title">servlet-mapping</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>　　运行该web程序。下面提供客户端调用代码：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Client</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        HessianProxyFactory proxyFactory = <span class="keyword">new</span> HessianProxyFactory();;</span><br><span class="line">        MyService service = (MyService)proxyFactory.create(MyService.class,</span><br><span class="line">                <span class="string">"http://localhost:8080/hessian-demo/myservice"</span>);</span><br><span class="line"></span><br><span class="line">        System.out.println(service.doSomething(<span class="string">"xixixixi"</span>));</span><br><span class="line">        System.out.println(<span class="string">"ok!"</span>);;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<h2 id="u670D_u52A1_u7AEF_u5B9E_u73B0_u673A_u5236"><a href="#u670D_u52A1_u7AEF_u5B9E_u73B0_u673A_u5236" class="headerlink" title="服务端实现机制"></a>服务端实现机制</h2><p>　　从上面的代码可以看出，在服务端的实现中，最重要的便是在web.xml中配置了一个HessianServlet。下面列出该类的关键代码，注意代码中的注释<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">init</span><span class="params">(ServletConfig config)</span> <span class="keyword">throws</span> ServletException </span>&#123;</span><br><span class="line">    <span class="comment">//获取servlet中配置的参数service-class</span></span><br><span class="line">    String className = <span class="keyword">this</span>.getInitParameter(<span class="string">"service-class"</span>);</span><br><span class="line">    <span class="comment">//加载该类</span></span><br><span class="line">    ClassLoader e = Thread.currentThread().getContextClassLoader();</span><br><span class="line">    <span class="keyword">if</span>(e != <span class="keyword">null</span>) &#123;</span><br><span class="line">        <span class="keyword">this</span>._serviceClass = Class.forName(className, <span class="keyword">false</span>, e);</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        <span class="keyword">this</span>._serviceClass = Class.forName(className);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">//初始化该类</span></span><br><span class="line">    <span class="keyword">this</span>._service = <span class="keyword">this</span>._serviceClass.newInstance();</span><br><span class="line">    ......</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">service</span><span class="params">(ServletRequest request, ServletResponse response)</span> <span class="keyword">throws</span> IOException, ServletException </span>&#123;</span><br><span class="line">    HttpServletRequest req = (HttpServletRequest)request;</span><br><span class="line">    HttpServletResponse res = (HttpServletResponse)response;</span><br><span class="line">    <span class="comment">//如果为get方法，则提示Hessian只支持post模式的请求方式</span></span><br><span class="line">    <span class="keyword">if</span>(!req.getMethod().equals(<span class="string">"POST"</span>)) &#123;</span><br><span class="line">        res.setStatus(<span class="number">500</span>, <span class="string">"Hessian Requires POST"</span>);</span><br><span class="line">        PrintWriter out2 = res.getWriter();</span><br><span class="line">        res.setContentType(<span class="string">"text/html"</span>);</span><br><span class="line">        out2.println(<span class="string">"&lt;h1&gt;Hessian Requires POST&lt;/h1&gt;"</span>);</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        Object out = <span class="keyword">this</span>._service;</span><br><span class="line">        <span class="comment">//因为使用了成员变量_skeleton，此处采用同步的代码</span></span><br><span class="line">        <span class="keyword">synchronized</span>(<span class="keyword">this</span>._service) &#123;</span><br><span class="line">            <span class="keyword">if</span>(<span class="keyword">this</span>._skeleton == <span class="keyword">null</span>) &#123;</span><br><span class="line">                <span class="keyword">this</span>._skeleton = <span class="keyword">new</span> HessianSkeleton(<span class="keyword">this</span>._service);</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            String serviceId = req.getPathInfo();</span><br><span class="line">            String objectId = request.getParameter(<span class="string">"ejbid"</span>);</span><br><span class="line">            <span class="keyword">if</span>(<span class="keyword">this</span>._service <span class="keyword">instanceof</span> Service) &#123;</span><br><span class="line">                ((Service)<span class="keyword">this</span>._service).setRequestObject(request, serviceId, objectId);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="comment">//包装输入输出流</span></span><br><span class="line">            ServletInputStream is = request.getInputStream();</span><br><span class="line">            ServletOutputStream os = response.getOutputStream();</span><br><span class="line">            HessianInput in = <span class="keyword">new</span> HessianInput(is);</span><br><span class="line">            HessianOutput out1 = <span class="keyword">new</span> HessianOutput(os);</span><br><span class="line"></span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                <span class="comment">//调用执行，在invoke中返回结果</span></span><br><span class="line">                <span class="keyword">this</span>._skeleton.invoke(in, out1);</span><br><span class="line">            &#125; <span class="keyword">catch</span> (Throwable var14) &#123;</span><br><span class="line">                <span class="keyword">throw</span> <span class="keyword">new</span> ServletException(var14);</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>　　从上面的代码可以看出，HessianServlet主要完成了服务类的初始化工作。同时在每次请求到达时，都是通过HessianSkeleton进行请求的处理和响应，下面我们开始分析HessianSkeleton。</p>
<h2 id="HessianSkeleton"><a href="#HessianSkeleton" class="headerlink" title="HessianSkeleton"></a>HessianSkeleton</h2><p>　　在HessianSekleton中主要完成了请求数据和相应数据的编解码工作，并通过反射的方式调用服务类！下面我们看看HessianSkeleton构造方法<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="title">HessianSkeleton</span><span class="params">(Object service)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">this</span>._service = service;</span><br><span class="line">    Method[] methodList = service.getClass().getMethods();</span><br><span class="line"></span><br><span class="line">    <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; methodList.length; ++i) &#123;</span><br><span class="line">        Method method = methodList[i];</span><br><span class="line">        <span class="keyword">if</span>(<span class="keyword">this</span>._methodMap.get(method.getName()) == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">this</span>._methodMap.put(method.getName(), methodList[i]);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        Class[] param = method.getParameterTypes();</span><br><span class="line">        String mangledName = method.getName() + <span class="string">"__"</span> + param.length;</span><br><span class="line">        <span class="keyword">this</span>._methodMap.put(mangledName, methodList[i]);</span><br><span class="line">        <span class="keyword">this</span>._methodMap.put(<span class="keyword">this</span>.mangleName(method, <span class="keyword">false</span>), methodList[i]);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>　　在hessian的构造方法中，我们完成了服务类方法的解析，并通过Map保存在_methodMap中，注意，此处考虑了重载方法的实现。另一个重要的方法就是invoke，该方法借助于HessianInput和HessianOutput完成了协议的编解码工作，可以理解为一个静态代理模式。<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">invoke</span><span class="params">(HessianInput in, HessianOutput out)</span> <span class="keyword">throws</span> Throwable </span>&#123;</span><br><span class="line">    <span class="comment">//请求数据开始解析</span></span><br><span class="line">    in.startCall();</span><br><span class="line">    Method method = (Method)<span class="keyword">this</span>._methodMap.get(in.getMethod());</span><br><span class="line">    <span class="keyword">if</span>(method == <span class="keyword">null</span>) &#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> IOException(<span class="string">"No server method matching:"</span> + in.getMethod());</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        Class[] args = method.getParameterTypes();</span><br><span class="line">        Object[] values = <span class="keyword">new</span> Object[args.length];</span><br><span class="line"></span><br><span class="line">        <span class="keyword">for</span>(<span class="keyword">int</span> result = <span class="number">0</span>; result &lt; args.length; ++result) &#123;</span><br><span class="line">            values[result] = in.readObject(args[result]);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="comment">//请求数据完成解析</span></span><br><span class="line">        in.completeCall();</span><br><span class="line">        Object var9 = <span class="keyword">null</span>;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            var9 = method.invoke(<span class="keyword">this</span>._service, values);</span><br><span class="line">        &#125; <span class="keyword">catch</span> (Throwable var8) &#123;</span><br><span class="line">            Throwable e = var8;</span><br><span class="line">            <span class="keyword">if</span>(var8 <span class="keyword">instanceof</span> InvocationTargetException) &#123;</span><br><span class="line">                e = ((InvocationTargetException)var8).getTargetException();</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            out.startReply();</span><br><span class="line">            out.writeFault(<span class="string">"ServiceException"</span>, e.getMessage(), e);</span><br><span class="line">            out.completeReply();</span><br><span class="line">            <span class="keyword">return</span>;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="comment">//请求数据开始写入</span></span><br><span class="line">        out.startReply();</span><br><span class="line">        out.writeObject(var9);</span><br><span class="line">        out.completeReply();</span><br><span class="line">        <span class="comment">//请求数据结束写入</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>　　可以看到，整个解析过程非常的简单。首先反序列化请求参数，在通过反射执行服务类，最后序列化响应结果并返回，仅此而已。</p>
<h2 id="u5BA2_u6237_u7AEF_u5B9E_u73B0_u673A_u5236"><a href="#u5BA2_u6237_u7AEF_u5B9E_u73B0_u673A_u5236" class="headerlink" title="客户端实现机制"></a>客户端实现机制</h2><p>　　客户端的代码很简单，主要涉及两个类：HessianProxyFactory和HessianProxy，其中HessianProxy继承自InvocationHandler，熟悉jdk动态代理的同学应该很熟悉。这里就不再详细介绍了。
　　</p>
<h2 id="u5E8F_u5217_u5316"><a href="#u5E8F_u5217_u5316" class="headerlink" title="序列化"></a>序列化</h2><p>　　无论是服务端还是客户端，都需要用到HessianOutput和HessianInput，它们才是真正进行序列化的工具。同时在com.caucho.hessian.io包中还提供了各种序列化与反序列工具。相比于jdk提供的序列化，hessian的序列化在数据量大小上无疑有着极大的优势。hessian的二进制协议主要分为三个部分：<br>　　1. 消息头：标识消息的开始。在tcp中，通常为了防止粘包现象，可以在消息头中存入消息的长度以保证正常的解析，也可以作为magic头，一定程度上保证消息的安全性。但是现在hessian提供的rpc是通过http完成的，貌似此时用处不大。<br>　　2. 消息体：如果为请求消息，则要是保存的是方法名和参数等信息。如果是响应消息，则通过com.caucho.hessian.io包中提供的序列化工具进行序列化写入。<br>　　3. 消息尾：标识消息的结束</p>
<h2 id="u603B_u7ED3"><a href="#u603B_u7ED3" class="headerlink" title="总结"></a>总结</h2><p>　　我们可以看出，采用hessian进行rpc调用是非常方便的，因为它已经帮我们实现好了消息的编解码和动态代理两个最核心的功能。同时它采用自定义的协议，在数据量大小上，相比于jdk的序列化机制，也是有非常大的优势的。不过，由于其只提供了http的访问方式，在高并发下存在一定的性能问题。参考代码：<a href="/code/hessian-demo.zip">hessian-demo.zip</a><br>　　在hessian的源码中，我们还可以看到包com.caucho.burlap的存在。与hessian基于二进制协议不同，它是基于xml协议的，这里不再赘述！这里我们主要使用了java版的hessian，实际上它还提供了.net、erlang、c等的实现。</p>
<h2 id="u53C2_u8003_u8D44_u6599"><a href="#u53C2_u8003_u8D44_u6599" class="headerlink" title="参考资料"></a>参考资料</h2><p><a href="http://qq85609655.iteye.com/blog/970266" target="_blank" rel="external">http://qq85609655.iteye.com/blog/970266</a><br><a href="http://hessian.caucho.com/" target="_blank" rel="external">http://hessian.caucho.com/</a></p>

      
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